linux-kernel - Re: [PATCH v2] net/phy: micrel: Add clock support for KSZ8021/KSZ8031

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Date:	Fri, 10 Oct 2014 09:38:20 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH v2] net/phy: micrel: Add clock support for KSZ8021/KSZ8031

On 10/10/2014 12:48 AM, Sascha Hauer wrote:
> The KSZ8021 and KSZ8031 support RMII reference input clocks of 25MHz
> and 50MHz. Both PHYs differ in the default frequency they expect
> after reset. If this differs from the actual input clock, then
> register 0x1f bit 7 must be changed.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> ---
> 
> Changes since v1:
> 
> - Move clock handling to the probe callback
> - Bail out with an error for invalid clock rates
> 
>  Documentation/devicetree/bindings/net/micrel.txt |  6 +++++
>  drivers/net/phy/micrel.c                         | 31 ++++++++++++++++++++++--
>  include/linux/micrel_phy.h                       |  1 +
>  3 files changed, 36 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/micrel.txt b/Documentation/devicetree/bindings/net/micrel.txt
> index 98a3e61..e1d99b9 100644
> --- a/Documentation/devicetree/bindings/net/micrel.txt
> +++ b/Documentation/devicetree/bindings/net/micrel.txt
> @@ -16,3 +16,9 @@ Optional properties:
>  	      KSZ8051: register 0x1f, bits 5..4
>  
>                See the respective PHY datasheet for the mode values.
> +
> + - clocks, clock-names: contains clocks according to the common clock bindings.
> +
> +              supported clocks:
> +	      - KSZ8021, KSZ8031: "rmii-ref": The RMII refence input clock. Used
> +		to determine the XI input clock.
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 011dbda..492435f 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -26,6 +26,7 @@
>  #include <linux/phy.h>
>  #include <linux/micrel_phy.h>
>  #include <linux/of.h>
> +#include <linux/clk.h>
>  
>  /* Operation Mode Strap Override */
>  #define MII_KSZPHY_OMSO				0x16
> @@ -72,9 +73,12 @@ static int ksz_config_flags(struct phy_device *phydev)
>  {
>  	int regval;
>  
> -	if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK) {
> +	if (phydev->dev_flags & (MICREL_PHY_50MHZ_CLK | MICREL_PHY_25MHZ_CLK)) {
>  		regval = phy_read(phydev, MII_KSZPHY_CTRL);
> -		regval |= KSZ8051_RMII_50MHZ_CLK;
> +		if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK)
> +			regval |= KSZ8051_RMII_50MHZ_CLK;
> +		else
> +			regval &= ~KSZ8051_RMII_50MHZ_CLK;
>  		return phy_write(phydev, MII_KSZPHY_CTRL, regval);
>  	}
>  	return 0;
> @@ -440,6 +444,27 @@ ksz9021_wr_mmd_phyreg(struct phy_device *phydev, int ptrad, int devnum,
>  {
>  }
>  
> +static int ksz8021_probe(struct phy_device *phydev)
> +{
> +	struct clk *clk;
> +
> +	clk = devm_clk_get(&phydev->dev, "rmii-ref");
> +	if (!IS_ERR(clk)) {
> +		unsigned long rate = clk_get_rate(clk);
> +
> +		if (rate > 24500000 && rate < 25500000) {
> +			phydev->dev_flags |= MICREL_PHY_25MHZ_CLK;
> +		} else if (rate > 49500000 && rate < 50500000) {
> +			phydev->dev_flags |= MICREL_PHY_50MHZ_CLK;
> +		} else {
> +			dev_err(&phydev->dev, "Clock rate out of range: %ld\n", rate);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  static struct phy_driver ksphy_driver[] = {
>  {
>  	.phy_id		= PHY_ID_KS8737,
> @@ -462,6 +487,7 @@ static struct phy_driver ksphy_driver[] = {
>  	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
>  			   SUPPORTED_Asym_Pause),
>  	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
> +	.probe		= ksz8021_probe,
>  	.config_init	= ksz8021_config_init,
>  	.config_aneg	= genphy_config_aneg,
>  	.read_status	= genphy_read_status,
> @@ -477,6 +503,7 @@ static struct phy_driver ksphy_driver[] = {
>  	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
>  			   SUPPORTED_Asym_Pause),
>  	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
> +	.probe		= ksz8021_probe,
>  	.config_init	= ksz8021_config_init,
>  	.config_aneg	= genphy_config_aneg,
>  	.read_status	= genphy_read_status,
> diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
> index 2e5b194..53d33de 100644
> --- a/include/linux/micrel_phy.h
> +++ b/include/linux/micrel_phy.h
> @@ -37,6 +37,7 @@
>  
>  /* struct phy_device dev_flags definitions */
>  #define MICREL_PHY_50MHZ_CLK	0x00000001
> +#define MICREL_PHY_25MHZ_CLK	0x00000002
>  
>  #define MICREL_KSZ9021_EXTREG_CTRL	0xB
>  #define MICREL_KSZ9021_EXTREG_DATA_WRITE	0xC
> 

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